find the taylor series of y=x^91/2) centered at a=4 and use the first two terms to apporximate 4.1^(1/2)
thanx in advance
Assuming you mean $\displaystyle y= x^{91/2}$, where, exactly, is your problem? Do you know how to differentiate $\displaystyle x^n$? Do you know the formula for the Taylor's series of a function?